Shelf



FIG. 1 is a perspective view of a shelf showing a new design.

FIG. 2 is a front elevational view thereof.

FIG. 3 is a rear elevational view thereof.

FIG. 4 is a bottom plan view thereof.

FIG. 5 is a top plan view thereof; and,

FIGS. 6 and 7 are side elevational views thereof and wherein the rightside and the left side elevational views are mirror images of eachother.

The ornamental design for a shelf, as shown and described.